To find the money remaining in the account, find the total price of the yogurt by multiplying them and then subtract the product from the money in the account.
Since 3 tubs of yogurt were bought, multiply the cost of one to 3
Start by ignoring the decimal points and multiply them normally
5.20
=
520
3×520
=
1560
Next, count how many place values there are from the decimal point to the right of the two factors.
5.20=2places
There are a total of 2 place value movements to the right of the decimal point.
Get the final product by moving the decimal point of the initial product 2 places to the left.
Hence, the total cost of the tubs of yogurt is $15.60.
Subtract this value from $20 to get the left over amount. Line up the decimal points (point over point).
If there are any blank values to the right of the decimal point, write 0.
2
0
.
0
0
-
1
5
.
6
0
Subtract as you would whole numbers
2
0
.
0
0
-
1
5
.
6
0
.
0
Since 0 is less than 6 we will use borrowing to subtract
0 (units digit) = borrow 1 from 2
0 (tenths digit) = borrow 1 from 10 (units digit)
9
1
10
10
2
0
.
0
0
-
1
5
.
6
0
0
4
.
4
0
Therefore, the money that is left over in Marie’s account is $4.40
$4.40
Question 2 of 4
2. Question
A roll of cable has 40m worth of cable. If the cable costs $9.85 per metre, how much would the entire roll of cable cost?
